On Aquatic Carnivorous Coleoptera or Dytiscidce. 415 



440. Hydroporus dispar, Germ., M.C. — Ovalis, brevissime pubescens, densissime 

 punctatus, opacus, nigricans, antennis, pedibus, capite, thorace elytrisque testaceis, 

 thorace medio latius infuscato, elytris lineis undique confluentibus obscuratis ; 

 corpore subtus densissime punctato. Long. 4|, lat. 2? m.m. 



In the male the front and middle tarsi are broad, and the front tibiae are 

 extremely thick, and have a very large excision in the middle inwardly : the middle 

 tibise are a little curved. The front tarsi of the female are elongate and slender. 



Australia, (Adelaide). 434. 



441. Hydroporus wollastoni, Clk., M.C. — Ovalis, brevissime pubescens, densis 

 sime punctatus, subopacus, ferrugineo-testaceus, antennis, pedibus, capite thorace- 

 que testaceis, elytris lineis plurimis nigris, ad latera et inter lineas primam et 

 secundam maculis interjectis ; corpore subtus densissime punctato, opaco ; tarsis 

 anterioribus et intermediis elongatis. Long. 4t, lat. 2l m.m. 



In the male the front and middle tarsi are broad ; the front tibias are moderately 

 broad, but their lower part is not thick, so that the notch on the inner edge 

 appears to make only a shallow excision : the middle tibite are a little cui'ved. In 

 the female the thorax forms a more continuous line with the elytra than it does in 

 the male, the surface is duller, and the front and middle tarsi are slender. 

 Though the species varies a good deal, I have not quite been able to connect H. 

 undecimlineatus, (No. 439), with it. 



Australia. 435. 



442. Necterosoma regulare, n. sp. — Ovalis, brevior, convexus, omnium brevissime 

 pubescens, subopacas, densissime, sat subtiliter ruguloso-punctatus, testaceus, pectore 

 abdomineque fuscis, thorace anterius et posterius elytrisque lineis latis nigris ; 

 corpore subtus densissime punctato, coxis fortiter rugulosis ; prothorace lateribus 

 ante medium obsoletissime angulatis. Long. 31, lat. 2s m.m. 



Ths male at first sight differs but little from the female ; it has however the 

 front and middle tarsi slightly broader, and the front tibise have a sliglit 

 emargination near the extremity, the middle tibix' also have their lower portion 

 somewhat excised. 



Australia, (Port DenLson, and North West Australia). 436. 



443. Necterosoma arcuatum, n. sp. — Ovalis, brevior, sat convexus vix pubescens, 

 opacus, densissime sat subtiliter ruguloso-punctatus, ferrugineus, prothorace 

 anterius et posterius nigro, elytris lineis nigris ; corpore subtus densissime punctato, 

 coxis sat fortiter rugulosis. Long. 3f, lat. 2i m.m. 



